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Aeroelastic prediction and analysis for a transonic fan rotor with the“hot”blade shape

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chinese Journal of Aeronautics 2021年第7期34卷 50-61页

作者： Di ZHOU Ziliang LU Tongqing GUO guoping c.en Key Laboratory of Unsteady Aerodynamics and Flow control Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Mechanics and control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

This paper focuses on aeroelastic prediction and analysis for a transonic fan rotor with only its“hot”(running)blade shape available,which is often the case in practical engineering such as in the design *** on an in-house and well-validated cFD solver and a hybrid structural finite element modeling/modal approach,three main aspects are considered with special emphasis on dealing with the“hot”blade ***,static aeroelastic analysis is presented for shape transformation between“cold”(manufacturing)and“hot”blades,and influence of the dynamic variation of“hot”shape on evaluated aerodynamic performance is ***,implementation of the energy method for flutter prediction is given and both a regularly used fixed“hot”shape and a variable“hot”shape are *** comparison,influence of the dynamic variation of“hot”shape on evaluated aeroelastic stability is also ***,another common way to predict flutter,time-domain method,is used for the same concerned case,from which the predicted flutter characteristics are compared with those from the energy method.A well-publicized axial-flow transonic fan rotor,Rotor 67,is selected as a typical example,and the corresponding numerical results and discussions are presented in detail.

关键词： energy method Fan rotor Flutter Running blade shape Static aeroelasticity Time-domain method

Optimal credibility Estimation of Random Parameters in Hierarchical Random Effect Linear Model

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Journal of Systems Sc.ence & complexity 2015年第5期28卷 1058-1069页

作者： Wen Limin FANG Jing MEI guoping WU Xianyi School of Mathematics and Information Sc.ence Jiangxi Normal University School of Information Management Jiangxi University of Finance and Economics Department of Statistics and Actuarial Sc.ence East China Normal University

In the hierarchical random effect linear model, the Bayes estimator of random parameter are not only dependent on specific prior distribution but also it is difficult to calculate in most *** paper derives the distributed-free optimal linear estimator of random parameters in the model by means of the credibility theory method. The estimators the authors derive can be applied in more extensive practical scenarios since they are only dependent on the first two moments of prior parameter rather than on specific prior distribution. Finally, the results are compared with some classical models and a numerical example is given to show the effectiveness of the estimators.

关键词： Bayes theory credibility estimator hierarchical linear model random effect

MODEL REDUcTION AND AcTIVE cONTROL FOR A FLEXIBLE PLATE

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Acta Mechanica Solida Sinica 2011年第5期24卷 467-476页

作者： Yong Xie Tong Zhao guoping cai Department of engineering Mechanics State Key Laboratory of Ocean Engineering Shanghai Jiaotong University Shanghai 200240 China

The internal balance technique is effective for model reduction in flexible structures, especially those with dense frequencies. However, due to the difficulty in extracting the internal balance modal coordinates from the physical sensor readings, research so far on this topic has been mostly theoretic and little on experiment or engineering applications. This paper, by working on a DSP TMS320F2812-based experiment system with a flexible plate and bringing forward an approximating approach to accessing the internal balance modal coordinates, studies the internal balance method theoretically as well as experimentally, and further designs an active controller based on the reduced model. Simulation and test results have proven the proposed approximating approach feasible and effective, and the designed controller successful in restraining the plate vibration.

关键词： flexible plate internal balance model reduction active control experiment

The passivation mechanism of Fe in the acidic Alcl_3-EMIc ionic liquid

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Green energy & environment 2017年第4期2卷 412-418页

作者： Dongpeng Xue Yang Yang guoping Ling School of Materials Sc.ence and engineering Zhejiang University

The passivation behavior of Fe in the acidic Alcl_3-1-ethyl-3-methyl-imidazolium chloride(Alcl_3-EMIc) ionic liquid was studied by linear sweep voltammetry and chonopotentiometry. Various approaches were used to characterize the composition and morphology of passive film formed on the Fe electrode, such as scanning electron microscopy(SEM), Raman spectra and X-ray Photoelectron Spectroscopy(XPS). The results showed that the critical passivation potential of Fe shifted to more negative when the molar ratio of Alcl_3:EMIc changing from 2 to 1.3.A film with a light yellow color was observed on the surface of the Fe electrode after passivation. The composition of the passive film was demonstrated to be Fecl_2. The passive film was composed of particulate Fecl_2 with average diameter of about 500 nm. The formation of Fecl_2 film was attributed to the variation of the electrolyte Lewis acidity from acidic to neutral at the interface during the dissolution process of Fe. The reason caused the variation of the electrolyte acidity was discussed.

关键词： Passivation mechanism Fe Ionic liquid Passive film Fecl2

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Editorial

The Journal of china Universities of Posts and Telecommunications 2023年第6期30卷 1-2页

作者： Jiang guoping c.en Guanrong Nanjing University of Posts and Telecommunications Nanjing 210003China city University of Hong Kong Hong Kong 999077China

complex dynamical networks have emerged as powerful tools for studying the characteristics and evolutions of various real-world social and engineering networks,such as multi-agent systems,power grids,biological networks,and epidemic *** study of complex dynamical networks is crucial for understanding complex systems and provides a solid theoretical foundation for network sc.ence and engineering.

关键词： networks network agent

Analysis of a Vortex Precipitation Event over Southwest china Using AIRS and In Situ Measurements

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Advances in Atmospheric Sc.ences 2017年第4期34卷 559-570页

作者： c.engc.eng NI guoping LI Xiaozhen XIONG School of Atmospheric Sc.ences Chengdu University of Information Technology Meteorological Observatory Chengdu Meteorological Bureau collaborative Innovation center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology centre of Satellite Application and Research NOAACollege Park

A strong precipitation event caused by the southwest vortex（SWV）, which affected Sichuan Province and chongqing municipality in Southwest china on 10–14 July 2012, is investigated. The SWV is examined using satellite observations from AIRS（Atmospheric Infrared Sounder）, in situ measurements from the SWV intensive observation campaign, and MIcAPS（Marine Interactive computer-Aided Provisioning System） data. Analysis of this precipitation process revealed that：（1）heavy rain occurred during the development phase, and cloud water content increased significantly after the dissipation of the SWV;（2） the area with low outgoing longwave radiation values from AIRS correlated well with the SWV;（3） variation of the temperature of brightness blackbody（TBB） from AIRS reflected the evolution of the SWV, and the values of TBB reduced significantly during the SWV＇s development; and（4） strong temperature and water vapor inversions were noted during the development of the SWV. The moisture profile displayed large vertical variation during the SWV＇s puissant phase,with the moisture inversion occurring at low levels. The moisture content during the receding phase was significantly reduced compared with that during the developing and puissant phases. The vertical flux of vapor divergence explained the variation of the moisture profile. These results also indicate the potential for using AIRS products in studying severe weather over the Tibetan Plateau and its surroundings, where in situ measurements are sparse.

关键词： precipitation event AIRS southwest vortex temperature profile moisture profile

Modal and Fatigue Life Analysis on Beam with Multiple cracks Subjected to Axial Force

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第5期35卷 874-882页

作者： Ma Yijiang c.en guoping Wu Xinhai School of Naval Architecture and Ocean engineering Jiangsu University of Science and Technology State Key Laboratory of Mechanics and control for Mechanical Structures Nanjing University of Aeronautics and Astronautics

Based on the transfer matrix method and Forman equation,a new method is proposed to conduct the modal and fatigue life analysis of a beam with multiple transverse *** the modal analysis,the damping loss factor is introduced by the complex elastic modulus,bending springs without mass are used to replace the transverse cracks,and the characteristic transfer matrix of the whole cracked beam can be *** the fatigue life analysis,considering the interaction of the beam vibration and fatigue cracks growth,the fatigue life of the cracked beam is predicted by the timing analysis *** calculation shows that cracks have a significant influence on the modal and fatigue life of the beam.

关键词： beam cracks axial force natural frequency fatigue life

On the Structures of K2(Z[G]), G a Finite Abelian p-Group

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Algebra colloquium 2019年第1期26卷 105-112页

作者： Yakun Zhang guoping Tang Hong c.en School of Mathematical Sc.ences University of the Chinese Academy of Sciences Beijing 100049 China School of Mathematical Sc.ences Soochow University Suzhou 215006 China

Let G be a finite abelian p-group,Г the maximal Z-order of Z[G]. We prove that the 2-primary torsion subgroups of K2Z[G]) and K2(Г)are isomorphic when p ≡ 3, 5, 7 (mod 8, and K2(Z[G])■zZ[1/p] is isomorphic to K2(Г)■zZ[1/p] when p = 2,3,5,7. As an application, we give the structure of K2(Z[G]) for G a cyclic p-group or an elementary abelian p-group.

关键词： algebraic K-theory K2-group integral group ring

Research progress of magnetic resonance imaging contrast agents

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chinese Sc.ence Bulletin 2001年第15期46卷 1233-1237页

作者： guoping Yan Renxi Zhuo Wuhan Univ Minist Educ China Dept Chem Lab Biomed Polymer Mat Wuhan 430072 Peoples R China

Magnetic resonance imaging (MRI) is a clinical diagnostic modality, which has become popular in hospitals around the world. Approximately 30% of MRI exams include the use of contrast agents. The research progress of the paramagnetic resonance imaging contrast agents was described briefly. Three important approaches in the soluble paramagnetic resonance imaging contrast agents design including nonionic, tissue-specific and macromolecular contrast agents were investigated. In addition, the problems in the research and development in future were discussed.

关键词： magnetic resonance imaging (MRI) contrast agents gadolinium(m) complexes tissue-specific.